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J, HOWARD & H. W. GIB-BSI PLOW. No. 351,864. Patented Nomi 1886.

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PLOW. Nq. 351,864. Patentd Nov. 2, 1886.

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i UNITED STATES JAMES HOWARD AND HENRY wiLLIAM GIBBS, BEDFORD, ENGLAND.-

PATENT OFFICE.

OF BEDFORD, COUNTY OF PLOW.

S C C O forming part of Letters Patent No. 351,864, dated November 2, 1886.

Application filed June 10, 1886. Serial No. 204.786. (No model.)

To all whom it may concern:

American types the shares are made with or havefitted to them a cutting-edge or shinpiece upon the landside, which cutting-edge or shin-piece performs the same work as the separate colter upon other plows. Although the advantage of this cutting-edge or. shinpiece over the ordinary separate colter is considerable under certain circumstances, the cost of the combined share and shin-piece is great, and the cost of maintaining the efficiency of the plow is enhanced. This is due to the fact that the lower portion of the cutting-edge or shin-piece becomes blunted or worn out before any appreciable wear has taken place in the upper portion thereof.

The main object of our present invention is to obviate this defect, and incarrying out our invention we provide a separate and reversible shin-piece of steel, chilled cast-iron, or

other suitable material, so that when the front cutting-edge or the lower end next the share becomes worn or blunted the unworn or less worn portion of the shin-piece may be brought into use.

In the accompanying drawings, Figure 1 shows in side elevation, Fig. 2 in back elevation, and Fig. 3 in plan. view, one form of reversible shin-piece detached from the plow. Figs. 4. and 5 show the reversible shin-piece applied to a plow of an Anglo-American type, Fig. 4 being an elevation of the land sideof so much of a plow as will serve to illustrate the application of our invention, and Fig. 5 a similar view of the furrow side of the plow. Figs. 6 and 7 show, respectively in side and plan views, a modification of the detachable shin-piece secured to the plow-frame.

We will first describe the example illustrated by Figs. 1, 2, 3, 4t, 5. Ais the reversible cuttingedge or shin-piece made fast to the turn furrow-plate or so-called mold-board B. O is a portion of the frame of the plow, and D is the landside-plate, the parts B and'D being secured to the plow-frame in the usual manner. E is the share secured to the nose of the plow-frame and fitted to the reversible shinpiece A in such a manner as to insure that the landside edge of the share shall be in the same plane with the landside face of the reversible shin-piece A.

By referring to Fig. 3 it will be seen that the fore part of the shinpiece is of a Vsection, and that its back part is rabbeted to about one-third of its maximum thickness. The two rabbets thus formed are intended to receive, respectively, the front edges of the mold-board and landside plate, and thereby to form a shield or protection to those edges against frictional contact with the soil. The thin back portion of the shin-piece A is extended rearward to form two lugs for the re ception of screw-bolts, by which the shin-piece is secured in its desiredposition.

The opposite ends of the shin-piece A are chamfered 0H inopposite directions, as shown in the detached view, Fig. 2, 'to provide for the close fitting of the same to the share, as indicated by the dotted lines in Figs. 2 and 3, and thelugs are bent, out of line, so that the one shall stand parallel to one inclined side and the other to the opposite inclined side of the shin-piece; Thus the lowermost lug will lie snugly against the landside-plate, (whichever lug is undermost,) as is indicated by the dotted lines in Fig. 3, which represent the plate D.

By reason of the lower end of the shin-piece engaging with the share, as illustrated at Figs. 4 and 5, it will not be possible for the shinpiece, although attached to the mold-board by one bolt only, to lift or get out of place during use.

, In general, the wear of the shin'piece Awill not extend above one-half its length; but when this wear has become considerable and it is found necessary to restore the efficiency of the plow the attendant will have simply to withdraw the coupling-bolt, turn the shin-piece end for end, and thus substitute the upper and unworn cutting-edge for the worn or blunted portion. The reinsertion ofthe screw bolt will then secure the piece A, as before.

5 In the example illustrated by Figs. 6 and 7 the shinplate is ehamfered at both edges, but on the same side of the plate, and it is furnislIed with two boltho1es, as in the first example, for securing it in position by a bolt 10 and nut attachment, being in this case to the plow-frame. It is chamfercd also at its ends to fit close against the hinder part of the share, as in the first example. For the purpose of shifting this shin-plate it is turned end to end 15 Without changing the position of the landside, and it is for this reason that both edges of the shin-plate are chamfered on the same side.

Ve are aware that it has been proposed to :0 construct a reversible shin-piece for plows; but the opposite sides of such shin-piece were the counterpart the one of the other-that is to say, its opposite sides were shaped to bed against the plow frame or standard, and its opposite edges were shaped the one to form a 2 right-hand and the other a left-hand cuttingedge. By our invention, however, a reversible shin-piece is obtained in a more economical way without detriment to its efficiency.

Vhat we claim as our invention is 30 The combination, with the frame and moldboard of a plow, of a shin-piece reversible end for end, substantially as herein described, for the purpose of presenting a fresh cuttingedge.

JAMES I-IO\VARD. HENRY \VILLIAM GIBBS.

Witnesses:

JNo. DEAN,

HERBERT E. DALE, Both of N0. 17 G-racechurch Street, London. 

